The Collaborative International Dictionary of English v.0.48:

Solar \So"lar\, a. [L. solaris, fr. sol the sun; akin to As.
   s[=o]l, Icel. s[=o]l, Goth. sauil, Lith. saule, W. haul,.
   sul, Skr. svar, perhaps to E. sun:F. solaire. Cf. Parasol.
   Sun.]
   1. Of or pertaining to the sun; proceeding from the sun; as,
      the solar system; solar light; solar rays; solar
      influence. See Solar system, below.
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   2. (Astrol.) Born under the predominant influence of the sun.
      [Obs.]
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            And proud beside, as solar people are. --Dryden.
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   3. Measured by the progress or revolution of the sun in the
      ecliptic; as, the solar year.
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   4. Produced by the action of the sun, or peculiarly affected
      by its influence.
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            They denominate some herbs solar, and some lunar.
                                                  --Bacon.
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   Solar cycle. See under Cycle.

   Solar day. See Day, 2.

   Solar engine, an engine in which the energy of solar heat
      is used to produce motion, as in evaporating water for a
      steam engine, or expanding air for an air engine.

   Solar flowers (Bot.), flowers which open and shut daily at
      certain hours.

   Solar lamp, an argand lamp.

   Solar microscope, a microscope consisting essentially,
      first, of a mirror for reflecting a beam of sunlight
      through the tube, which sometimes is fixed in a window
      shutter; secondly, of a condenser, or large lens, for
      converging the beam upon the object; and, thirdly, of a
      small lens, or magnifier, for throwing an enlarged image
      of the object at its focus upon a screen in a dark room or
      in a darkened box.
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   Solar month. See under Month.

   Solar oil, a paraffin oil used an illuminant and lubricant.


   Solar phosphori (Physics), certain substances, as the
      diamond, siulphide of barium (Bolognese or Bologna
      phosphorus), calcium sulphide, etc., which become
      phosphorescent, and shine in the dark, after exposure to
      sunlight or other intense light.

   Solar plexus (Anat.), a nervous plexus situated in the
      dorsal and anterior part of the abdomen, consisting of
      several sympathetic ganglia with connecting and radiating
      nerve fibers; -- so called in allusion to the radiating
      nerve fibers.

   Solar spots. See Sun spots, under Sun.

   Solar system (Astron.), the sun, with the group of
      celestial bodies which, held by its attraction, revolve
      round it. The system comprises the major planets, with
      their satellites; the minor planets, or asteroids, and the
      comets; also, the meteorids, the matter that furnishes the
      zodiacal light, and the rings of Saturn. The satellites
      that revolve about the major planets are twenty-two in
      number, of which the Earth has one (see Moon.), Mars
      two, Jupiter five, Saturn nine, Uranus four, and Neptune
      one. The asteroids, between Mars and Jupiter, thus far
      discovered (1900), number about five hundred, the first
      four of which were found near the beginning of the
      century, and are called Ceres, Pallas, Juno, and Vesta.
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   Note: The principal elements of the major planets, and of the
         comets seen at more than one perihelion passage, are
         exhibited in the following tables:
         [1913 Webster] I. -- Major Planets. Symbol.Name.Mean
         distance -- that of the Earth being unity.Period in
         days.Eccentricity.Inclination of orbit.Diameter in
         miles ?????????????????????
         [1913 Webster] II. -- Periodic Comets. Name.Greatest
         distance from sun.Least distance from sun.Inclination
         of orbit.Perihelion passage. [deg] [min] 54
         Encke's3.314.100.34212 541885.2 ?????????????????????
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   Solar telegraph, telegraph for signaling by flashes of
      reflected sunlight.

   Solar time. See Apparent time, under Time.
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The Collaborative International Dictionary of English v.0.48:

Cycle \Cy"cle\ (s?"k'l), n. [F. ycle, LL. cyclus, fr. Gr.
   ky`klos ring or circle, cycle; akin to Skr. cakra wheel,
   circle. See Wheel.]
   1. An imaginary circle or orbit in the heavens; one of the
      celestial spheres. --Milton.
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   2. An interval of time in which a certain succession of
      events or phenomena is completed, and then returns again
      and again, uniformly and continually in the same order; a
      periodical space of time marked by the recurrence of
      something peculiar; as, the cycle of the seasons, or of
      the year.
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            Wages . . . bear a full proportion . . . to the
            medium of provision during the last bad cycle of
            twenty years.                         --Burke.
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   3. An age; a long period of time.
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            Better fifty years of Europe than a cycle of Cathay.
                                                  --Tennyson.
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   4. An orderly list for a given time; a calendar. [Obs.]
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            We . . . present our gardeners with a complete cycle
            of what is requisite to be done throughout every
            month of the year.                    --Evelyn.
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   5. The circle of subjects connected with the exploits of the
      hero or heroes of some particular period which have served
      as a popular theme for poetry, as the legend of Arthur and
      the knights of the Round Table, and that of Charlemagne
      and his paladins.
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   6. (Bot.) One entire round in a circle or a spire; as, a
      cycle or set of leaves. --Gray.
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   7. A bicycle or tricycle, or other light velocipede.
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   8. A motorcycle.
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   9. (Thermodynamics) A series of operations in which heat is
      imparted to (or taken away from) a working substance which
      by its expansion gives up a part of its internal energy in
      the form of mechanical work (or being compressed increases
      its internal energy) and is again brought back to its
      original state.
      [Webster 1913 Suppl.]

   10. (Technology) A complete positive and negative, or forward
       and reverse, action of any periodic process, such as a
       vibration, an electric field oscillation, or a current
       alternation; one period. Hence: (Elec.) A complete
       positive and negative wave of an alternating current. The
       number of cycles (per second) is a measure of the
       frequency of an alternating current.
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   Calippic cycle, a period of 76 years, or four Metonic
      cycles; -- so called from Calippus, who proposed it as an
      improvement on the Metonic cycle.

   Cycle of eclipses, a period of about 6,586 days, the time
      of revolution of the moon's node; -- called Saros by the
      Chaldeans.

   Cycle of indiction, a period of 15 years, employed in Roman
      and ecclesiastical chronology, not founded on any
      astronomical period, but having reference to certain
      judicial acts which took place at stated epochs under the
      Greek emperors.

   Cycle of the moon, or Metonic cycle, a period of 19
      years, after the lapse of which the new and full moon
      returns to the same day of the year; -- so called from
      Meton, who first proposed it.

   Cycle of the sun, Solar cycle, a period of 28 years, at
      the end of which time the days of the month return to the
      same days of the week. The dominical or Sunday letter
      follows the same order; hence the solar cycle is also
      called the cycle of the Sunday letter. In the Gregorian
      calendar the solar cycle is in general interrupted at the
      end of the century.
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